Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3b8f969a3100957e3937f6f04924a49310f766731719e91b359a687deed3f3' 
  AND token = 'wt0MHtwQWD3xLmmpv9ICIrSraGd/vsXUxuNEQ126Vzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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