Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999a6176d10ccbcf1d0db91293ca85340b2d80be85180ceba11fdc86fc238b31' 
  AND token = 'VfAa4xGapl6ntaRSqZEPr6YBrOfg3KMFbgYiU9WVRnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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