Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6a650fc2377ad9a80c811b9b90a4ab358abda8b51733a2d5e5c3d711639e1e' 
  AND token = '9tD1/jpYHIOl7iyg+xhLfnvAxymdQiextZzKgCUAYIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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