Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dcb39c3a87d605bd6d060c066b64d5643dc3a2debf8b99a1e55643d5adf70d' 
  AND token = 'BjQ+VIXzpGQIl/bGPbg73IvcG4OIzXqVRTo7tLTdrVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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