Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547424277dbd2003b640c771bace235e5aea9b325cc1f52f12830e0ff1df0333' 
  AND token = '9mnBnr+WGHaln0CgYskOW5PKw4eiZPvOfZvoZhQisOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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