Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed131cb850b42a3a5dc937ccac6c0d6c872899e041ec6b34a5fd30254ae300c' 
  AND token = 'pftsmoYFe1ebI5Ns6CjubT/5XBAxduJ3zh+/vdkPf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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