Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f52f1fd037904e0fbd827dea259fca6ee70303d6580860e32ceaeaaca3890e4' 
  AND token = '/tyIesJantoY6SWqzWLRm9+YJwjNQP2x0FxT9peOsg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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