Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78f08b4582c419ca3af59a696b3de8110c76acdfd01d93eaa3e7ad62a9a06fc' 
  AND token = 'QEuxv7GKuJu1XzeIxjGwKio2rrv9hVxidBFViMrNvvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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