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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '46416559522c28ba9d0461c5d886b3b9808516d75dcf770cf0df7fa1a8528c60' 
  AND token = 'ri5gKwx/q51o5lFaMGmnKWoansn6ZDvpY1dtD+IiF8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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