Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c0247201e66f79bc6d09f99afd9d0304b605a1ffdb256f4b8171c24e735ed6' 
  AND token = '8TCk8eIdgLrN1GHwqElmaaBaeMTRqgxsmDSXBVrF6U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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