Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f78b95436878433c1072e95a43a0867a03c300e5fb19b26fe296898f47f202' 
  AND token = '506EvYP64ki5bR4mWyh9wJ43P7A9KFhs9nigorc40W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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