Current Show Meta Query

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'start_time_raw',
		'value'   => 'current_time',
		'compare' => '<',
		'type'    => 'DATETIME',
	),
	array(
		'key'     => 'end_time_raw',
		'value'   => 'current_time',
		'compare' => '>',
		'type'    => 'DATETIME',
	),
);