Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3517096f54b2395de981b9a4b47a1fbd9815f4031841d795242567562b7e8665' 
  AND token = 'hL+JCTrpP2LFTcwQon9g9rxzzMis3oOe3cFo5xay4/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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