Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ada6317aed128e3cf73d1891d54e1f7b25f1bd8e4e7e8a1ef16715c299e4be9' 
  AND token = 'GXrgdv5Kjx8vRvYie1A5XW28W4Spc9oLg45NhU+uzKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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