Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ffc984a63fc0c89f4c522e1de4c6aa8d9f89280a0e7a08f38d33bc5e259628' 
  AND token = 'gzmNsxVEqgI8F6AjP1E9YQbTNrqyFPEYyP3B1rLR4OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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