SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13524b32ca22d26f3abbda447e60a46b03034fcdb645150f9ac565abdeb22d1c' 
  AND token = 'YZgI3vqCCHmtO32gCB7q5h+7SyEZMOWf5fjJoJlHuKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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