Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a548bb200a7307c39822d6f869ad428ed6c53844eeeb7c0f584ad7e86478e1' 
  AND token = 'nv20D+DkDm+Vk/ylVfmoeUgfOnUWvsrJkGA97U9nWv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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