Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ae3e67b11f3729288c76e06ceb980ea546666bc3b22137c60e8874d11ac9bb' 
  AND token = 'Nsn+nltJQXoZt11H632iCSRBDDs5l3IBBQeFo4e/Lw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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