Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a8811be135b92f51906125a932ca15c99de93e308b9783b99384827c8a13ab' 
  AND token = '5/LlD5jtfH2ftkJYTstmrefpSuwi4afOWZLnEpgEKDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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