SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1f125b56989e2f066b47f0d43ef6054905d9f0579f8ac6fc490ec8f4cb712db9' 
  AND token = 'QF85+3mOhOHJdRHMk382DBbcFv5Y/e4qEnabr47xouw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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