<?php

// If setting timezone when saving data, $midnight += get_option( 'gmt_offset' ) * HOUR_IN_SECONDS;
$args = array(
    'post_type' => array( 'page' ),
    'order' => 'DESC',
    'orderby' => 'meta_value_num', // Numeric sort.
    'meta_query' => array(
        array(
            'key' => '_cmb2_live_start_test_datetime_timestamp',
            'compare' => '<=',
            'value' => time(),
        ),
        array(
            'key' => '_cmb2_live_end_test_datetime_timestamp',
            'compare' => '>=',
            'vaule' => time(),
        ),
    ),
    'posts_per_page' => 1,
);

$listen_query = new WP_Query( $args );
?>

<?php if( $listen_query->have_posts() ): ?>

  <?php while ( $listen_query->have_posts() ) : $listen_query->the_post(); ?>
    <?php
    if ( ( time() > get_post_meta( get_the_ID(), '_cmb2_live_start_test_datetime_timestamp', true ) && ( time() < get_post_meta( get_the_ID(), '_cmb2_live_end_test_datetime_timestamp', true ) ) { ?>
      <a href="#"><span class="fa fa-microphone"></span><span class="listen">Live Broadcast!</span></a>
    <?php } ?>

  <?php endwhile; ?>

<?php endif; ?>

<?php wp_reset_query(); ?>