Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e98f2e9e0a491318fdb7ba9923f353a71621f8b5987e00a7546cb5fc96a233' 
  AND token = 'blyqf/o1KBS5ahmcSKnn7gDhkzFNZyafBqgyxQFLfsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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