Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e03e4731ce28fa49e9ed922442ad1f33f65af63b3910a3222840b5d3ba8e1d' 
  AND token = '/aa5DFbrNgXgxk6BflH0vEPPuDPT2fgS4gBkGra3YXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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