Target post_date_gmt if it’s empty or not set

I’ve figured it out:

'meta_query' => array(
    array(
        'relation' => 'OR',
        array(
            'key' => '_setting_update',
            'value' => '1',
            'compare' => '=='
        ),
        array(
            'relation' => 'AND',
            array(
                'key' => '_created_date',
                'value' => '',
                'compare' => 'NOT EXISTS',
            ),
            array(
                'key' => '_modified_date',
                'value' => '',
                'compare' => 'NOT EXISTS',
            ),
        )
    ),
),

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