Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd61a8e53e33b3f05dd2e7c86786eb0e955d7a09e28b250dc5ad79b612c419f2' 
  AND token = 'RCcUOymluu+wEaQhUFoyjKo5hOCSh4W9Dq9iuTeofn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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