Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c4cf4125f942d7b9b0c53c3f594cf1c67e61447a28cf05eb7d3b50ff94fa5b' 
  AND token = '5OKQwxvkc7zV9qhDfry2amQOseFEHNuhZlTavcTrhlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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