Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca97fb50f7f956a97edb8cb78972c4bd15a883cf5b20d1c0e1bce292e26bc7f2' 
  AND token = 'RK6LaENgw0J49g8kDbNFxPVzAwv+S8li7Zo0PH02c4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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