SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1597ef6434f8b3151ad6608049cc728b07fa700918875a3471dac8a4e2c8460f' 
  AND token = 'kw/T8hsO1/xLuD5wIOYjMewbjJH64OoZW2C1ggLXW+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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