Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5dcb1f42e799ad0da0d784cce489ff1f33b52c56bdee8408a34cffd4ab909c' 
  AND token = 'H0AH2Hk+Jv7l1hAdVZH8wpjcFqtneJCidj7u0+/WPWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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