Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '617e3761d951b1de0bd9e954ee5644090cc24c9754b568a962a8bbf33d49ffc0' 
  AND token = 'QfVnd3R11xxTb68wmzNGhDyIp8dnTLktVrToAc7zlOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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