Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34849441cc9dea083aeef445788ea490b946a10f42ce137a72717681cde794aa' 
  AND token = 'k0LBYqyEFBKoWL1vGgzec9FtIhUsIAkuBn3LdJahDv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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