Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6c1879ac4a85b601c51bd1df9090ccab11308089121802baca4c19c82b6cef' 
  AND token = 'axeitv4mu+GuBPqwim0f8rH0yznv/tFH+VOm5cGIU/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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