Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de75be1dc19d271465beb42038c028e90ffdb92f14015dc9456beff010b5fdd' 
  AND token = 'DJCONg8LeVC2Cq3CZXaAHuYchquX5MWbV2pjeX8JyYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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