Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd728a5247ba0c601ef9dc724cb30d6e2e586bda44fa60608ae68ad7001ad15ce' 
  AND token = '6UsCCTouDvdPJ7+JcUdPFivdV+fRPmrn7eygzY8et3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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