Mail Meta

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'acf-p_status_status',
		'value'   => 'discontinued',
		'compare' => '!=',
	),
	array(
		'key'     => 'acf-mailchimp-exclude',
		'value'   => '1',
		'compare' => '!=',
	),
	array(
		'key'     => 'acf-mailchimp-include',
		'compare' => 'EXISTS',
		'type'    => 'DATETIME',
	),
);