Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff3c16d4abc4cd601ee4f0eb6ab8ab58e63f27535f5d4e8453f21e0707f2dc8' 
  AND token = 'bGmmw5Tv0pMuXlZE8DJjX9HAlnkPDG7y7T8ySNAIOlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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