Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5a998a6b4f133eeb66872d7e4207024b1304a9d96db9c2af1a6a1958f2b9e2' 
  AND token = 'pAGZ4kTvWhKuTNa3HmIHQNU0abx8iTLnuuvUrb+FMhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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