Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648fd4bc2e5a5997c7052c434af2e251914dac2438af842f69e4e7e9cac0a208' 
  AND token = 'SiRncLlNmnUoAT3STCEmkmX1w0/QmJzflvpXUlRJVB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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