Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362d8b24e0393b5c485fb2e3e41a40baca0973fb03365cf635a7d52745452f2a' 
  AND token = 'Io9cSxZuhzE7N7aL3h5Eia5wyedjrOCOdIhmf4XTXaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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