Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c88569a75940d8fe3028c1e7255b283a50b1fe50b262fe0ca1302650a0e62f7' 
  AND token = 'jttgAvlyB/qZDMqnqTqqX/kYLbTcOx37gG3/qVH9Izg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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