Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a6743878a74cbe226bda8c1630d6bf43b08454dbfc7b9a8c29204303f3c2f8' 
  AND token = 'UdEoAqK9tUS9dsYd2lnNmBmnsZBc9aEtsxkG4vNuEYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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