Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4af7fd4ff1aa1b28d01b1cb3e787a5cac9bb45fb58eca15de56b2d1e67a7ad5' 
  AND token = 'SIwkDVhGkIqKJ/mGM3aDsnF2If+aVxSG/uuFKFqwhFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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