Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bf09972bece855cc4e470aa3c2c9ac06dc6b65ae974e1a742debe2ed51f348fd' 
  AND token = 'QCeQIC6pxkBRJ77t1JqIqqauKgdyX5PADLYb1/N//iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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