Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339100b4f4a6ddda7650180a63127b8a69192417585e1501843d3af8bd87fae3' 
  AND token = 'liXOQt4XWKjkWZAtnwcVQXK0i/q3IvDSnjGixaXVU5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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