Query posts if meta key starts with

I figured it out:

$the_query = new WP_Query(array(
    "numberposts" => -1,
    "post_type" => "plays_events",
    "meta_query" => array(
        array(
            "key"     => "show_times_%_date",
            "value"   => $this_month . "[0-9]{2}",
            "compare" => "REGEXP"
        )
    ),
));

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