Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db3fdc0652dbcfff086cf9cea2b24fc95c57d3e8a0cdc1a5d5086666a731791' 
  AND token = 'nX4GFHad8BdiphbrOvulKA2RzveuCLzhaxck+JCCazA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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