SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98105da77cb6f089b51715a8c2ca0a0fa6de2e6e249d395600036588baf3baee' 
  AND token = 'W6N5kg9/osnGY4Ji85A3wjPp7dwD3QxhCfO4rFXTS+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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