Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0271c1e740498cb59620705e0002c10e868b28dbd9828ccef130e3f1af204c81' 
  AND token = 'k8rtcOdubRiN3K1mvJTGedGSOjEl9xlR7pEfT0undOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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