Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2ef62122b20a9081eb00a5b36d765880aac48b499b641ce9e4346040bb4d7b' 
  AND token = 'ud4/Lh9iavztcGy3ZMI6qmwwBGxZQfgmkBcPWg0XJz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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