SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0897df242389fac801299b5fbcd1c106a11d763dffb7daa1276967e2c7b626a1' 
  AND token = 'bmZDPAgEYmskfizaxNnU6Xe6hGvJxBhgWJDBlt5bEBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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