Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1e75ec1b7b9f7f306dc57cefe1337fab8ef64ce3d5b24029fcefe9e18af723' 
  AND token = 'hnS9/x0XsXSP35oK9k6SrBcvsfV4Aq7xDND+opoAqzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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