SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b5f3e940ec76f87163c5ed08a7f1dc192704f8ad48b6117b3b005939b5ca1d2e' 
  AND token = 'd2+WacaMb/DGWVxDZIUsfPVBBGGqJYiyD2AoCFLLT2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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