WP Query, WP/CP | Type: PHPWordPress Meta Query (Basic Example)

Meta Queries compare multiple keys and values.

$args = array(
    'meta_query' => array(
        array(
            'key' => 'key1',
            'value' => 'value1',
            'compare' => '='
        ),
        array(
            'key' => 'key1',
            'value' => 'value2',
            'compare' => '='
        )
    )
);
$query = new WP_Query( $args );

Reference Links

https://codex.wordpress.org/Class_Reference/WP_Meta_Query

https://www.advancedcustomfields.com/resources/query-posts-custom-fields/