Help please with function

I’ve got a function which have to return meta keys

function deco_get_metakeys() {
	$args  = array(
		'post_type'      => 'post',
		'posts_per_page' => - 1,
		'meta_query'     => array(
			'relation' => 'OR',
			array(
				'key'   => 'deco_post_is_slide',
				'value' => 1,
			),
			array(
				'key'   => 'deco_post_choose_redaction',
				'value' => 1,
			),
			array(
				'key'   => 'deco_post_interview',
				'value' => 1,
			)
		)
	);
	$query = new WP_Query( $args );

	while ( $query->have_posts() ) {
		$query->the_post();
		$exclude_post[] = $query->post->ID;
	}

	return $exclude_post;
}

It return empty array, can somebody explain where did i go wrong?