Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fdf5bdd8a7cc5edb2b7b0c4ce25f97685314461aa466f929225f6df2f56c18' 
  AND token = 'TDjTE6dMlTHlj5GHqX/IMZA1Tz5Y0EnnAdnbZ/aDswI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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