Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8546365878804e39c0c31a01b0837b27e1e0eae8ca65f031a38ba28182dc38be' 
  AND token = '1FS21MLCkmoBUQ7CXDwbFB/xv13rWEGdvaf9g19rGt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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