Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f336c456f8d70cdb3d7075dde5830693d1f3f923cf2a5ab3b9b5c9d7cbe46a4' 
  AND token = '6p/3JTe7DI5yaxfsd8oZaFs/q3ZMaUE/ouUFoViD96U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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