Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6112181cb0d7f0f8d1ddc903d21b241919b021cbdaddb57cf8b2ef70e310b957' 
  AND token = 'DFbizaK2PVOi3DcTXedNFv6D6t+mGrAqRUStGITE3eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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