Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f1f69bd6637c1f98fac3bcff2c6ace0efd6792a087a8b667566c62c5a327f1' 
  AND token = '8RM5fXVGWXNgmrTmrSX7o7kjRs6CxsgDq1hIydPHlQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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