SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5706a6986b7dd2f98862a775b6619affaa5d7a37bb470e167c130b294e5c588f' 
  AND token = '1tk2YQabcNfDfMZB+JOswQ+4HLJdLtnkngFfHyHV/zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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