Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a81d340c7058cbf07734f73ae6fea103e5171ee2297db8486f71d0199ac4e3' 
  AND token = 'r10fMCJfupBh+ar6oTXQdR/ckqbYdv8maP+8KKsl9nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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