Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c6aac3eb17850f2f5259a6b88a5ca8493e9589539c6669db7c6b7c2071f0c' 
  AND token = 'd0JcfvdC6wflXPlRtBy+qOC7GkrgN7+Ot4pkC01QtPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}