Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349c6d9b2752bb6d7e189928a4cf237039c175c65a809fe174218e5ba2f90471' 
  AND token = 'KK169zw387cE0uxlVScsLv1HFHa6Vf3ksDR1elGnHaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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