Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f6ea58c12cef2eb3151622c9488a06d0e8cc397a8c87c2315ebb42bde92f1fef' 
  AND token = 'HWiw0OmebdAa50nNMq5ZpCd5yTYUtWXwKaOs91xZyAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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