Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d0ae4cd3b5e8c2d97f0429fd3f75fd15c95a9b1c85f16f148907d1d302a797' 
  AND token = '203U6dNLJYprshXtPNXaNigO2SH48j1jNrk0zYiK5wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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