Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb609972cc695514da6f0d530db3d565d5b53fbb36fbfcf4ebef34f4a9806900' 
  AND token = 'EmFjmtMhDYrkcS5jNMTMObMd2HCpeVTKgSe+KcinnYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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