SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d94679dbf5dfbfa876f418ac6d3c80cc4bf0ca17bd08f116c1f0d620ab43f40' 
  AND token = '4WWcrkItR3kW9oG0hu2GM9UoP6NHvjOVBtPKC8wl+Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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