Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a850e075804c28fc00fdb3fe68f4045ca80776178567e1ba7be882faaa75a93b' 
  AND token = 'gXrAbOhwK9A9zJ2CfBV6tCtisT3OGsF5GJXlfPT7GgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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