Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32bbb042f3dc8042f52170b942ec00c471943993910cdfa97d541a51c8aeb90' 
  AND token = 'jBtkkZ8/PlaV6OEdxdd8ed1Z5n2g4smXQ2Ft3rZITfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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