Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97950950e0851c8845fb70ebc788bc0d935a59e73f0fbf4e9946390719cc53e9' 
  AND token = 'diuk3sbF/GK3/fFdblxRNDUytm63nKOiASq9FRPmPu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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