Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87688cbeaedb12b3d812fcb5513a53218848040a6e940c207e7bb6a828a9193b' 
  AND token = 'C0mPJ+KqHmVs9H2RZoIb5YN43KJAvJNjIbiD9vJwZD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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