SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '434e6803fd7c1e0ae4dba62bb333fc98c0e056774dc2425585f10ce661606755' 
  AND token = 'tRvsBnhZ4GFKcOjag3V+apyCqu+NEF5VzT5Q8hL2SEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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