Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6e9a1514eea58f4a660e6c2c02b0ca1a922928f9c59b77ac2f4538891134aa' 
  AND token = 'MCSNfOnx8NTmwxM0Zd6Ks6KTxpd2oiaSIZqVm8FHD2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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