SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '997d22e229b91584b5d40074bdf8c1999dd2aae4f5c30509ea53de2ab6d68af9' 
  AND token = '4vzVofFj/LBFR+Amf96zNpYrHjgyLgalUZKFtp4b+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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