Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b84f5a1437cc6ec4d4960e996caf35b86380ff43ab27591a62def9db770fa8' 
  AND token = 'h8FyKRwscFiKDYZCHRbTvyvJ3Nqf9LoQ78ZtnQGXt68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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