Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f89d7e31b68e5dfa3eea99e432a22935fdb21aaf06c9e8be8b6c665bc4f1a4' 
  AND token = 'yc8HWiXx46GUq+Xfz0ysGanH5cerQcOZykNMSdvhLGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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