Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd837ebcd84de1b0a6c3c57eebb6fe33a0211b67741b46475c2078f671d79e8b5' 
  AND token = '5SgLe7MUxMwJ2WDtz4KmhtFvMPZU7IeDZAcvisFaUyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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