Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69ab7fd552e76b008d4db584429aa7121803113e1fd63c0f21d2dfcbf3ae3dd' 
  AND token = 'fNsGLeAAhHnzlP3c3bBZwTm05d0E6P1Fo1Pxn4Qq84o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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