Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287276abeded480d3027f35a791768c4da59a0507c95fbe8005c518df66736b8' 
  AND token = 'SxVkattA9eUrTdlwBQ+RN8aKkq2VRsTgdGqvZ2uWO9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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