SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '40c43b1de5b21782add33562947c7ce7a2f9db156adf5f54447c87b7219f1e5a' 
  AND token = '0QGYjkHtuIJ9Hss284UCgARdHvPeKKCTCrlfSZAzmIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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