Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b237feb9d4c4e2f87c3474751a882c6470743f5ee144f60188442ff2733e86a7' 
  AND token = 'HnbZRlmba5hVmw7AIH7ebOQ1jW7Rv6m/7OSzQL+JIgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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