Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a84cc7b6e06d232ecfc79d4e250d751a97a24b1640aa1cdaf7ef0c45b16c42' 
  AND token = 'N+KSYJ10BOarWcE3AWYDm04SdDYunRyOwtlWCd/is4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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