Posts active and expired in different loops Wordpress - php

Question

I am in search of the best way to display pages active posts categories and expired after a certain period. I want to display active posts or have no expiration date in the main loop and those that expire in a loop below.
For this I used the plugin advanced custom field ( expiration ) which define the expiration date. With loops below, I get the result I want, however, would help to improve. For example, in the loop of expired posts, the H2 tag appears on the page even if there are no expired posts, and if I move it under the condition "if ( $ exhale < $ blogtime )", it appears in all expired posts, what do not want, I want to appear only once above all expired posts.
Another question I have is whether these loops will somehow require more work from the server, since it will have to make new appointments.
<?php if ( have_posts() ) : ?>
<?php if ( is_home() && ! is_front_page() ) : ?>
<header>
<h1 class="page-title screen-reader-text"><?php single_post_title(); ?></h1>
</header>
<?php endif; ?>
<?php
// Start the loop.
while ( have_posts() ) : the_post();
$blogtime = date( 'm/d/Y H:i:s', current_time( 'timestamp', 0 ) );
$blogt = date( '0' );
$expire = get_field('expiration');
if( $expire > $blogtime ) {
get_template_part( 'template-parts/content', get_post_format() ); }
elseif( $expire < $blogt ) {
get_template_part( 'template-parts/content', get_post_format() ); }
// End the loop.
endwhile;
endif;
?>
<?php
$args = array(
'post_type' => array('post','news'),
'posts_per_page' => 15,
'cat' => $cat,
'meta_key' => 'expiration',
'orderby' => 'meta_value_num',
'order' => 'DESC',
);
$eventloop = new WP_Query($args);
if ( $eventloop->have_posts() ) :
echo '<h2>Expired</h2>';
while ( $eventloop->have_posts() ) : $eventloop->the_post();
$blogtime = date( 'm/d/Y H:i:s', current_time( 'timestamp', 0 ) );
$blogt = date( '0' );
$expire = get_field('expiration');
if( $expire < $blogtime ) {
if ( $expire > $blogt ) {
get_template_part( 'template-parts/content', get_post_format() );
} }
endwhile;
endif;
?>