Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc686d886b80ba15fef1d42a6dc593fe56eb6f0fff53e9f64a0b4e5d47aeee2a' 
  AND token = 'qFVYs/my01UTNavl2LEyC/xsLg+ewNIbmzIF9xm7uLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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