Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e517d98cd7b2f7d2984820b48af7bd804b5b915f45311cfbea4723c5bd433bc4' 
  AND token = 'vyWeQ2rziFa07uym7ZdBaxiFijlgAMTix+UXsk9237I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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