Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19738e6c4304d56ed92c0663de4bc0539e6f80298eca7363e199606d3684b95d' 
  AND token = 'v/lzAoJ4LYosXdlff+hvHstbxHdMEB851lRVX2PG6ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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