Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4f8893e9db5a5ff33ee53a46ef2a9c3dcaced77d4cf1d171451c1ae1230c4e' 
  AND token = 'VeR6HoKM/8eGrywh7b0EaN2ReUYWtVRVjYEzSaoNcrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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