Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c604b3d28962f48ea24a23f50e35634b861269efe7f3b135d2328974919dc1d8' 
  AND token = 'Qbdbm7XaWuOI6n9Ds0Tk+Z36qP66u7XXaeXlvDxdr7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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