Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dda54357d49accdbd10d14073cf21e211509d77fe4fbbbe5ae5fc5594ed6c7' 
  AND token = 'fS5pKBGcXrs6WoWa6Up56aoqYRAYMwmaU56J8NXd2C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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